How to Write a Letter and Address an Envelope in Canada

The recipient's postal code tells Canada Post exactly where to route the mail. A valid code like K1A 0B1 follows a strict pattern: letters and digits alternate, with a space after the third character. This article explains the envelope layout, the letter itself, using AI and word-count tools sensibly, and international letters.

Envelope Layout

Canada Post specifies a clear address format. Each element goes on its own line, top to bottom. The country line is only for mail sent from abroad. Use the official Canada Post addressing guide for the complete rules.

• Line 1: [recipient name]
• Line 2: [street and house number]
• Line 3: [TOWN] [REGION CODE] K1A 0B1 (in capitals)
• Line 4: CANADA (in capitals, only for mail from abroad)

For mail within Canada, omit the country line. The postal code appears on line 3, after the region code, with two spaces separating them.

The Letter Itself: Formal vs Personal

Formal letters start with the date and place, then a greeting like "Dear [Mr./Ms. Last Name],". State your purpose clearly in the first sentence, write the body, close with "Sincerely,", and sign with your printed name below. Personal letters are more relaxed: a friendly greeting, a clear message, and a warm closing like "Best wishes". In both cases, keep the tone respectful and the message clear.

Using AI and Word-Count Tools Sensibly

Drafting a letter can feel slow. An AI chat that helps draft the letter can generate a solid first version. Review what the AI writes. Check that every fact is correct, the tone matches your relationship with the recipient, and the address follows Canada Post rules. Then run the text through a word and character counter to keep the letter an appropriate length—no more than one page for most formal letters, for instance. If you are writing to or from another language, use an AI translator for letters to translate the draft, but always verify the result with a native speaker or a second tool.

International Letters

When mailing to Canada from another country, add CANADA on the last line in capitals. When mailing from Canada to another country, write the destination address in the local format, then add the country name in capitals on the last line. The Universal Postal Union sets international addressing standards. Before you seal the envelope, find the correct postal code using the PostalCodeCA.com postal code search.

Frequently Asked Questions

Where exactly does the postal code go on the envelope?

On line 3, after the REGION CODE, separated by two spaces. Example: TORONTO ON K1A 0B1.

Should I use commas or periods in the address?

No. Write [street] [house number] with a single space, and TOWN REGION CODE with a single space, then two spaces before the postal code. No punctuation in the address.

Can I use AI to write the whole letter for me?

Yes, but always review and edit the output. AI can make mistakes with names, dates, or tone. An AI chat can draft the letter, then you refine it to be accurate and personal.

What if I am sending a letter from Canada to another country?

Write the address in the format used by that country, then add the country name in capitals on the last line. Check the Universal Postal Union standards for the correct layout.